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I have the same problem - tech support was able to say nothing about it.

It's some kind of interference though, and my solutions have been to have a loud background music , or to use the digital optical output.

EDIT: In case someone is intrested - I can hear the sound from both built-in speakers when the volume is turned up. When using an external output device, like headphones, the sound is only hearable in the right speaker of the device. These more sensitive devices, like my Sennheiser 600HD headphones, play back the sound in a noticable way at all volumes, excluding mute. The volume of the sound is tied to the volume of the output signal (if I turn the volume up in my OS, the buzz's volume also goes up).